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Trimmer Cord
Trimmer
Guard
Figure 28
Transmission
Guard
Bolts and Flat
Washers
Figure 29
"V" Groove
Idler Locknut
Washer
Plate
Figure 30
Engine Belt
Guide
Transmission
Locknut
Figure 31
®
GENERAC
20
TRIMMER/MOWER
Replacing the Trimmer Head Belt (Self Propelled model)
Bolts and Flat
Washers
Tools and Parts needed:
3/8" Wrench
7/16" Wrench
9/16" Wrench
Philips Head Screwdriver
V Belt: 3L440 (Gates #6744)
1. Tip the machine back onto the handlebar to access the underside (Figure
28).
2. Remove the Trimmer Cords from the Head Assembly.
3. Remove the four Trimmer Guard Bolts and Flat Washers with a 3/8"
Wrench. Remove the Trimmer Guard.
4. Remove the four Transmission Cover Bolts and Flat Washers with a 3/8"
Wrench (Figure 29). Remove the Transmission Cover.
5. Remove the Locknut that secures the Washer Plate to the flat groove Idler
Pulley using a 9/16" Wrench. Loosen the other Locknut to the V groove Idler
Pulley using a 9/16" Wrench just enough so the Washer Plate can be rotated
out of the way (Figure 30).
6. Loosen the Drive Belt Guide Locknut at the rear of the Frame using a 7/16"
Wrench and rotate the Guide out of the way (Figure 31).
7. Loosen the left side Engine Belt Guide Locknut using a 7/16" Wrench. This
allows some movement in the Belt guide for Transmission clearance.
Flat Groove
8. Rotate the Transmission down toward the back just enough to slide the
Idler Locknut
small Drive Belt from the Engine Pulley
9. Remove the Trimmer Head Belt from around the Engine and Head Assembly
Pulleys.
10. Install a new Trimmer Head Belt around the Engine and Head Assembly
Pulleys.
11. Rotate the Transmission into position as you guide the Drive Belt into the
Engine Drive Pulley groove.
12. Tighten the Engine Belt Guide Locknut using a 7/16˝ Wrench.
13. Rotate the Drive Belt Guide at the rear of the Frame into position and tighten
the Locknut with a 7/16" Wrench.
Drive
Belt
Drive
Belt
Guide
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